Telephone-transmitter



2 Sheets-Sheet 1.

(No Model.)

N. 15. PALMER.

TELEPHONE TRANSMITTER.

No. 358,941. Patented Mar. 8, 1887.

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(No Model.) 2 Sheets-Sheet 2.

N. P. PALMER. V TELEPHONE TRANSMITTER No. 358,941. Patented Mar.-8, 1887.v

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WITNEESEEI I Q N'VWENTU UNITED STATES PATENT OFFICE.

NOYES F. PALMER, OF JAMAICA, NEW YORK.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 358,941, dated March 8, 1887.

Application filed July 30, 1886. Serial No. 209,513. (No model.)

To all whom, it may concern.-

Be it known that I, NoYEs F. PALMER, of Jamaica, Queens county, State of New York, have invented anew and Improved Telephone- Transmitter, of which the following specification is a full, clear, and exact description.

This invention relates to an improved tele phone transmitter with multiple points adapted for use upon both short and very long lines, and capable of transmitting with equal clearness and purity whispers and loudlyspoken words or other sounds.

The invention consists of the various features of construction hereinafter more fully pointed out.

In the accompanying drawings, Figure 1 is a vertical cross-section of my improved telephone. Fig. 2 is a back view of the same, together with the switch-boards. Fig. 3 shows a side view in section of one of the carrying arms and electrodes on an enlarged scales Fig. 4. is a front view of the same, and Fig. 5 is a section at line a; 00, Fig. 3. Fig. 6 is a plan of the main switch on an enlarged scale.

Bis the case of the instrument,to which the plate L, with mouth-piece A, is mounted and provided with a circular cavity, 0. \Vithin this case B a second plate, L is arranged, which is provided with a corresponding circular cavity, G. The cavity 0 is closed by a diaphragm, 1), attached to the inside of the plate L, and a diaphragm, D of smaller size than the cavity G is arranged in this cavity 0 and connected to the diaphragm D by a central screw-rod, 8 This screw-rod .9 extends through the diaphragm D' and is attached 'to an adjusting damper-spring, s, by means of two nuts, 8' s", screwed upon the end of the rod 8 The lower end of the damperspring 8 is attached to the back B of the case.

By means of nuts n and m on the rod s the position of the diaphragm D on said rod, and consequently its relative position with the diaphragm D, can be adjusted.

At the inside of the plate L a frame, H, is attached, and a similar frame, H is attached at the back or inside of the plate L To the top and bottom of the frame H eight (more or less) springs, G, are attached, and a similar number of springs, G, are attached to the top and bottom of the frame H These springs G and G have prolongations g some distance past the point of connection with the frames .H and H", through which regulating-pins v 12,

respectively, are passed and screwed into the plates L and L. Between these prolongations g g of the springs G G and the plates L L" spiral springszare placed around the pins 11 o. By this arrangement the inner free ends of the springs G G may be regulated. To the springs G G the electrode-carrying arms F F are attached.

The springs G G and electrode-arms F F are placed directly behind each other on the plates L L In the drawings only one inner plate, L with electrodes, is shown; but it will be readily understood that two or more similarly-constructed plates with electrodes may be arranged in the case, one behind the other.

The construction of the electrode-carrying arms with electrodes is represented on a larger scale in Figs. 3, 4, and 5, and is as follows: Each electrode-carrying arm is provided at each end with shoulders or projections P P. The inner projection, 1?, is attached to the diaphragm D or D", while the outer end of the electrode-carrying arm attached to the spring G has projections P, forming a jaw, (see Fig. 5,) through which two split pins, W

NV, are passed, the latter pin, 7', being of so suitable insulating material. To these pins NV WV the respective electrodes E and E are attached. r

V is a wedge placed between the split pins \V and W, by means of which the elec trodes are held securely in said split pins.

The main switch M is automatic double-acting,and consists of lever 8, Fig. 6, turning on a center with an oval non-conducting plate, 9. This plate acts between two spring-levers, 10 10, attached at one of their ends at 12 12.

\Vhen the receiving-telephone T is not used, the same .is hung upon the lever 8, bringing thereby by its weight this lever 8 and the plate 9 in the position shownin Figs. 1 and 6, where the spring-lever 10 is in connection with pin 13, when the apparatus will be disconnected.

WVhen the receiving-telephone is unhooked to be used,the spring 11 will act upon the lever 8, moving the same and the plate 9 in the position shown in dotted lines,'Fig. 6, pressing thereby the levers 10 10 apart, so as to come in contact with the pins 141. 14:, forming thus the necessary connection for operation and for using the telephone. By this arrangement a cheap and effective automatic switch is produced.

In Fig. 1 is represented the necessary lineconnections from main line a to main switch M, thence to local coil or coils G", thence through line d to local switch-board N,- thence, when plug p of the switch-board is in place, through line It to the receiving-telephone T; also, through line-connection, (local current) from batteries R through It to local switch K, through w to main switch M, thence to coil 0 (primary) through line a" to electrodes E E,

and back to battery.

The operation is as follows: Sound-waves upon diaphragms D and D cause vibrations to each set of electrodes simultaneously,which produce simultaneous vibrations in the linecurrent, and these vibrations are transmitted to the receiving-instrumentin the usual manner.

In the above-described transmitter all the electrodearms F F are rigidly attached to the diaphragms D D which being connected t0- gether by rod 8 the secondary set of electrodes act simultaneously together with the first or primary set. Further, no two sets of electrodes receive the same impact. WVhen receiving the same Vibrations it produces unequal pressure upon the electrodes; hence greater variations to the current will result. The electrodes nearest the center of the diaphragm receive the greater force, and this force changes to each set of electrodes, although pitch of the sound-waves remains harmonious.

It is well known in long-distance service that it is difficult to increase the force of the vibrations upon a diaphragm without destroying their pitch or harmony. My improved construction produces in practice no discord when the force is increased.

The arrangement of adding increased battery-currents to separate electrodes acting as one is such as to least affect the adjustment of each singly, and, if required, one battery can be divided in part'to each electrode, or all batteries used to one or to two or more electrodes, as desired in different adjustment.

I claim as my invention-- 1. In a telephonc-transmitter, the combination of diaphragm D with one or more diaphragms, D, each diaphragm being provided with electrode-carrying arms and electrodes, said diaphragms being connected together by rod s and with damper-spring s, substantially as and for the purpose described.

2. The combination of a case, 13, monthpiece A, diaphragms D D connecting-bar s, and damper-spring s, with four (more or less) carrying-arms, F F, with electrodes E E, and with battery, induction-coils, and switch, as and for the purpose substantially set forth.

3. The combination of springs G G, carrying-arms F F, with electrodes E E, split pins V W, wedge V, and diaphragms, and with battery, substantially as specified.

4. In a telephone-transmitter, the combina tion of electrode-carrying arms, electrodes E E, and diaphragms, the springs G, provided with elongation g and with regulating-screw o and spring 2, substantially as and for the purpose described.

NOYES F. PALMER.

XVitnesses:

R0131. H. ROY, HENRY E. RoEDER. 

